Arik Funke created ARROW-6403:
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             Summary: Expose FileReader::ReadRowGroups() to Python
                 Key: ARROW-6403
                 URL: https://issues.apache.org/jira/browse/ARROW-6403
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Arik Funke


Expose ReadRowGroups to Python to allow efficient filtered reading 
implementations as suggested @xhochy in 
https://github.com/apache/arrow/issues/2491#issuecomment-416958663_

Without this PR users would have to re-implement threaded reads in python.



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